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From what I could tell from someone's YouTube video of their room tour, they use a proximity-sensor-type lock, where you hold your keycard near the lock to unlock it. This makes the keycard a little thicker than normal magnetic stripe keycards, and also more expensive to replace if you lose it (and I thought I'd read reviews that said what people had been charged for lost keys).

Yes, all the rooms have the same type of lock. As described, they're the proxiity type; you don't have to actually insert the card into a slot. I would stress that they are very close proximity though - you can't just wave the card around in the general vicinity of the door and have it open.

Inside the room, in addition to a locking knob that you can turn, there's a "deadbolt" sort of thing that you can use that prevents the door from opening even if someone manages to unlock it. I make it a practice to ALWAYS use these deadbolts when I'm inside ANY hotel room, anywhere in the world.